diff --git a/explorer/testdata/function/fail_invalid_fnty.carbon b/explorer/testdata/function/fail_invalid_fnty.carbon
index f3e9e38ceaf1..77642b7d3389 100644
--- a/explorer/testdata/function/fail_invalid_fnty.carbon
+++ b/explorer/testdata/function/fail_invalid_fnty.carbon
@@ -13,7 +13,7 @@ package ExplorerTest api;
 // TODO: We should type-check the prelude before the main input so that we can
 // use it within the types of top-level declarations.
 // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/function/fail_invalid_fnty.carbon:[[@LINE+2]]: type error in `-`:
-// CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/function/fail_invalid_fnty.carbon:[[@LINE+1]]: missing declaration for builtin `Negate`
+// CHECK: missing declaration for builtin `Negate`
 fn f(g: __Fn(-true) -> true) {
 }
 
diff --git a/explorer/testdata/generic_function/fail_not_addable.carbon b/explorer/testdata/generic_function/fail_not_addable.carbon
index 6f8e8c6deae9..9576fc273222 100644
--- a/explorer/testdata/generic_function/fail_not_addable.carbon
+++ b/explorer/testdata/generic_function/fail_not_addable.carbon
@@ -12,7 +12,7 @@ package ExplorerTest api;
 
 fn id[T:! Type](x: T) -> T {
   // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/generic_function/fail_not_addable.carbon:[[@LINE+2]]: type error in `+`:
-  // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/generic_function/fail_not_addable.carbon:[[@LINE+1]]: could not find implementation of interface AddWith(U = i32) for T:! Type
+  // CHECK: could not find implementation of interface AddWith(U = i32) for T:! Type
   return x + 0;
 }
 
diff --git a/explorer/testdata/operators/fail_no_add.carbon b/explorer/testdata/operators/fail_no_add.carbon
index ebda08226692..4d063eadd422 100644
--- a/explorer/testdata/operators/fail_no_add.carbon
+++ b/explorer/testdata/operators/fail_no_add.carbon
@@ -15,7 +15,7 @@ class A {}
 fn Main() -> i32 {
   var a: A = {};
   // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_add.carbon:[[@LINE+2]]: type error in `+`:
-  // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_add.carbon:[[@LINE+1]]: could not find implementation of interface AddWith(U = i32) for class A
+  // CHECK: could not find implementation of interface AddWith(U = i32) for class A
   a + 1;
   return 0;
 }
diff --git a/explorer/testdata/operators/fail_no_mul.carbon b/explorer/testdata/operators/fail_no_mul.carbon
index ac5e3c931d26..0b6ab1fcc712 100644
--- a/explorer/testdata/operators/fail_no_mul.carbon
+++ b/explorer/testdata/operators/fail_no_mul.carbon
@@ -15,7 +15,7 @@ class A {}
 fn Main() -> i32 {
   var a: A = {};
   // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_mul.carbon:[[@LINE+2]]: type error in `*`:
-  // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_mul.carbon:[[@LINE+1]]: could not find implementation of interface MulWith(U = i32) for class A
+  // CHECK: could not find implementation of interface MulWith(U = i32) for class A
   a * 1;
   return 0;
 }
diff --git a/explorer/testdata/operators/fail_no_negate.carbon b/explorer/testdata/operators/fail_no_negate.carbon
index 892f59e6aa36..249ffcdbf455 100644
--- a/explorer/testdata/operators/fail_no_negate.carbon
+++ b/explorer/testdata/operators/fail_no_negate.carbon
@@ -15,7 +15,7 @@ class A {}
 fn Main() -> i32 {
   var a: A = {};
   // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_negate.carbon:[[@LINE+2]]: type error in `-`:
-  // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_negate.carbon:[[@LINE+1]]: could not find implementation of interface Negate for class A
+  // CHECK: could not find implementation of interface Negate for class A
   -a;
   return 0;
 }
diff --git a/explorer/testdata/operators/fail_no_sub.carbon b/explorer/testdata/operators/fail_no_sub.carbon
index 91455b8cf896..492d54c35342 100644
--- a/explorer/testdata/operators/fail_no_sub.carbon
+++ b/explorer/testdata/operators/fail_no_sub.carbon
@@ -15,7 +15,7 @@ class A {}
 fn Main() -> i32 {
   var a: A = {};
   // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_sub.carbon:[[@LINE+2]]: type error in `-`:
-  // CHECK: COMPILATION ERROR: {{.*}}/explorer/testdata/operators/fail_no_sub.carbon:[[@LINE+1]]: could not find implementation of interface SubWith(U = i32) for class A
+  // CHECK: could not find implementation of interface SubWith(U = i32) for class A
   a - 1;
   return 0;
 }